Albedo Estimates - Approach 4

("Stand Age" Approach)

Summary: This document contains a summary of albedo estimates produced through 'Approach 4' (using an age-based variant of the albedo model), including the figures listed below:

  • Section 1. Plots relevant to final albedo estimates.
  • Section 2. Mixed effects model + output.
  • Section 3. Relevant data + albedo estimates for each site.

Section 1

This figure shows several plots related to the final albedo estimates produced by Approach 4.

Section 2

This figure shows an initial attempt at a mixed effects model analysis.

Correlation matrix of explanatory variables:

Model in R: Random effect is month nested under site ("LocalityName"). Clearcut_Lidar (i.e. "age" of plot) is added as a fixed effect.

model <- lmer(Composite_Albedo ~ Treatment +
                      Productivity_Index +
                      Canopy_Height_MAD +
                      Clearcut_Lidar +
                      Moose_Density +
                      Red_Deer_Density +
                      Roe_Deer_Density +
                      (1 | LocalityName/Month),
              data = model_data)

Model Output:

  Composite_Albedo
Predictors Estimates CI p
(Intercept) 0.31960 0.25181 – 0.38739 <0.001
Treatment [open] -0.00108 -0.00185 – -0.00032 0.006
Productivity_Index -0.04974 -0.13274 – 0.03327 0.240
Clearcut_Lidar -0.00673 -0.01162 – -0.00185 0.007
Moose_Density 0.00112 0.00044 – 0.00180 0.001
Red_Deer_Density 0.00066 -0.00117 – 0.00249 0.478
Roe_Deer_Density -0.00247 -0.00409 – -0.00085 0.003
Random Effects
σ2 0.00
Ï„00 Month:LocalityName 0.01
Ï„00 LocalityName 0.00
ICC 1.00
N Month 12
N LocalityName 37
Observations 888
Marginal R2 / Conditional R2 0.067 / 0.998

Exploring Model Fit:

Section 3

This section shows relevant data and albedo estimates for each SustHerb site.

## Site:  bratsberg  - Age:  15  years

## Site:  didrik_holmsen  - Age:  10  years

## Site:  drangedal1  - Age:  12  years

## Site:  drangedal3  - Age:  9  years

## Site:  drangedal4  - Age:  9  years

## Site:  eidskog  - Age:  7  years

## Site:  fet_3  - Age:  7  years

## Site:  fritsoe1  - Age:  8  years

## Site:  fritsoe2  - Age:  12  years

## Site:  furesdal  - Age:  10  years

## Site:  halvard_pramhus  - Age:  8  years

## Site:  hi_tydal  - Age:  10  years

## Site:  kviteseid1  - Age:  13  years

## Site:  kviteseid2  - Age:  12  years

## Site:  kviteseid3  - Age:  17  years

## Site:  malvik  - Age:  14  years

## Site:  namdalseid_1kub  - Age:  4  years

## Site:  nome_cappelen1  - Age:  11  years

## Site:  nome_cappelen2  - Age:  11  years

## Site:  notodden3  - Age:  15  years

## Site:  notodden5  - Age:  10  years

## Site:  notodden6  - Age:  14  years

## Site:  nsb_verdal  - Age:  9  years

## Site:  selbu_flub  - Age:  11  years

## Site:  selbu_kl  - Age:  12  years

## Site:  selbu_sl  - Age:  13  years

## Site:  singsaas  - Age:  10  years

## Site:  sl_tydal  - Age:  10  years

## Site:  stangeskovene_aurskog  - Age:  10  years

## Site:  stangeskovene_eidskog  - Age:  8  years

## Site:  steinkjer_1bbb  - Age:  6  years

## Site:  steinkjer_2bbb  - Age:  7  years

## Site:  stig_dahlen  - Age:  9  years

## Site:  sub_namdalseid  - Age:  6  years

## Site:  truls_holm  - Age:  9  years

## Site:  verdal_1vb  - Age:  10  years

## Site:  verdal_2vb  - Age:  12  years